Planetary Spectra?

[NickK]

I'm out of my league on this but I'm assuming that a spectrograph could also be used on planets (ie analysing the red spot for example)?

Trying to figure if I should plumb for a daystar filter+erf or a spectrograph (such as an Alphy+guider) to spice up the options i have.

Curiosity at this stage.

[Merlin66]

The spectra of the moon and planets is basically reflected sunlight with additional absorption bands caused by the atmosphere.

You'll easily pick up the Methane etc features...

Positioning a narrow slit across the GRS I think would not show much spectral detail - unless the concentration of gases is much higher than the surrounding surface.

Why an ALPY? There are many other options, starting with a Star Analyser grating....

[Gasman]

I took some of Uranus and Neptune a while back Nick, showed the Methane and Ammonia peaks well, looked interesting when you subtract a G2V (similar to the sun) spectrum from it.

I too am debating an Alpy+guider or L200 ??? decisions, decisions.

Steve

[NickK]

The alphy was basically nice idea as it's all together .. however I'm very tempted, reading up though.. I'm eyeing up the A80Mf as a DIY..

[Gasman]

The alphy was basically nice idea as it's all together .. however I'm very tempted, reading up though.. I'm eyeing up the A80Mf as a DIY..

Whats the idea there Nick is it to use the parts to make a spectroscope?? Would be interested myself to see that or any info on it!

Steve

[Merlin66]

Steve,

Details on DIY spectroscopes, or spectrohelioscopes?

ASfA p124

http://www.astrosurf.com/cieldelabrie/sphelio.en.htm